My cat insists on drinking water ONLY from the bathroom sink, if I fill his water from, ANY OTHER water source, the kitchen sink, a hose, bottled water, he will not drink it. Almost makes me wonder what he knows or perceives that i do not.
The sinks that are not in the bathroom have the old "metal pipe" taste to them, and the bathroom sink water does not, I can't decide if it's some sort of coincidence or preference on the cat's part or something more sinister. :(